What makes a web tool Web 2.0?

Example Web 2.0 Tools

Pick from one of the tools below (or choose your own) for our activity today
Glogster - Group 2
Voicethread - Group 6
Wallwisher or Linoit - Group 9
Wordle or Tagxedo - Group 1
Cover it Live - or Chatzy
Edublogs - Group 10
Xtranormal - Group 4
Google Maps - or Google Earth - Group 8
Tiki-Toki Timeline or X-Timeline
bubbl.us mindmap - - Group 7
SpicyNodes - Group 3
Storybird - Group 5